This year is already a good year for Northwestern Pritzker School of Law’s Center on Wrongful Convictions, with three of its clients being cleared so far, including two on the same day.The Cook County State’s Attorney’s Office on Jan. 16 announced it would drop charges against Eric Blackmon, who spent nearly 16 years in prison for a murder he didn’t commit. That same day, a Rockford judge acquitted Patrick Pursley of murder after a two-day bench trial. Pursley had spent 24 years in prison.Karen L …